Electricity supply or production meters, single phase and AC static watt-hour meters of class 1 and 2: devices that record electrical energy used in homes and businesses.

Imports must meet BIS/IS standards for static meters and accuracy class; give CT/PT ratings and communication options. Measuring and analytical instruments are precision goods: provide calibration certificates traceable to national standards, accuracy specifications and operating manuals, and pack in foam-lined cases with desiccant to protect sensors and optics from shock and humidity.